It's Terraport. This was the first stage of the game Vectorman.
It's a small stage. The left-most quarter of the stage has two pillars of different heights. These pillars act as platforms. You can also move about beneath the pillars. Occasionally, a TV will appear. If you attack and destroy it, it will produce an item(sorry, no Smash Balls, Dragoon Parts, Hydra Parts or Assist Trophies).
The background is of a gray cloudy sky and the entire stage is made of metal. With flags and flagpoles.